A hair treatment method comprising the steps of:(a) optionally bleaching hair by applying a bleaching composition comprising from ammonium carbonate or a divalent metal cyanate and a source of hydrogen peroxide(b) dyeing the hair by applying a colouring composition comprising a sulphur-containing nucleophile and a dye compound selected from a dye class other than the class of reactive dyes and(d) removing colour from the hair by applying a colour removal composition comprising a sulfur-containing nucleophile or a precursor thereof.
